The Water Police Squad has been called to more than 100 incidents in the first week of 2025, up from 17 during the same period in 2024 and 36 in 2023.
Many of the call-outs have related to dangerous use of jet skis, including speeding, travelling too close to other swimmers and colliding with other vessels, police said.
Incidents on the water this summer have included collisions between jet skis and boats. (Joel Carrett/AAP PHOTOS)
A rescue on Saturday afternoon involved a jet ski and boat colliding on Safety Beach on the Mornington Peninsula.
A 14-year-old boy who was a passenger on the jet ski had to be flown to hospital after suffering serious upper body injuries.
The male rider and a second passenger, aged 43 and 14, also had to be rescued from the water and were taken by road to hospital.
Two boat passengers suffered minor injuries.
Police seized the jet ski and boat as part of their investigation, which is ongoing.
Victorians are urged to be careful in the water to avoid more accidents and injuries. (Julian Smith/AAP PHOTOS)
That same afternoon in Rye, a jet ski carrying three teenage males nosedived into a wave, throwing all three overboard.
The teens were not hurt but officers had to tow the jet ski because its hull had broken apart.
Water Police Squad Inspector James Dalton said hot weather was not an excuse to do the wrong thing while enjoying Victoria's waterways.
"Already we've seen multiple serious collisions on the water," he said.
"These young people are lucky to be alive, but instead of enjoying the summer they're now recovering in hospital with serious injuries.
"People need to remember that a split-second decision can have lifelong consequences."
Police are warning they will patrol busy waterways this weekend. (Joel Carrett/AAP PHOTOS)
The warning comes after Life Saving Victoria made 145 rescues on Saturday, Victoria State Control Centre spokeswoman Reegan Key said.
"That's a really high number and, obviously, there are lots of people on holiday at this time of year," Ms Key said at the weekend.
"We're asking people to be a bit more aware and careful as they head to the beach, rivers and lakes."
Police are planning a heavy presence across Port Phillip Bay, including inner Melbourne beaches and Hastings, the Mornington Peninsula and Surf Coast, as well as Paynesville, over the weekend ahead.
Officers will breath test drivers, check marine licences and scan vessels for safety equipment such as lifejackets.
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